Mark Capture Recapture

Estimating Population Abundance: Mark-Recapture

            Ecologists are often interested in understanding population dynamics.  That is, how populations change over time in terms of genetic make up and number of individuals.  The size of any population is dependent on many things.  Population size and genetic make-up (gene pool) may change due to immigration/emigration, drift, and factors influencing births and deaths.  How do ecologists estimate the size of any population of interest?  This can be a perplexing issue, especially if the population is quite large or cryptic.  It would be inefficient in terms of time and effort to count each and every individual, so ecologists estimate population size using several methods.  The methods used vary depending mainly on the organism of interest.  Plants are sessile, whereas most animals are mobile organisms.  A line-transect estimate may be useful for enumeration of sessile organisms, but not so for mobile organisms, or ones that are difficult to observe.  Mark-recapture is a useful method for determining the abundance of many animal populations.  There are several types of mark-recapture estimates available.  We will utilize the Petersen method of mark-recapture to estimate the population abundance of Drosophila over time.

Capture Mark Release Recapture (CMMR) that mark, release and recapture sample population as a method of observation. CMMR is a method commonly used to estimate the population size. The first thing to do is determine where that will estimate, then calculate and identify it, and the results can be made in the system list. CMMR method does this by taking and releasing a number of black and white buttons were considered a population scattered in nature. The results show the enormous population that is marked with white buttons and will be marked with black buttons.

From the result of the arrest, it can be expected size or the size of the population by the formula: description:

N: Lincoln-Peterson method

N = Mn / m + √ (M). (N). (Mm). (Nm) / m 3

and

N = Mn / m - √ (M). (N). (Mm). (Nm) / m 3

N - x = a and N + x = b

 A<N<b

N: Count the total individual in nature to be estimated in a population.

M: Count tercuplik individuals first and tagged, then released again.

n: Counting individual marked in the next period.

m: Counting individual marked caught again in the second period and the next